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What is the simplified form of ( \frac{m!}{(m-2)!(m-1)} )?

Answer and explanation

Correct answer: (m)

To simplify a factorial fraction, expand the larger factorial only as far as needed to expose the factorial in the denominator. This avoids unnecessary multiplication. The denominator contains \((m-2)!\) and the factor \((m-1)\), while the numerator contains both of these factors and one additional factor \(m\). After cancellation, only \(m\) remains, so option A is correct.

Use \(m!=m(m-1)(m-2)!\). Then \(\frac{m!}{(m-2)!(m-1)}=\frac{m(m-1)(m-2)!}{(m-2)!(m-1)}=m\), provided the factorial expression is defined and the denominator is nonzero. The factors \((m-1)\) and \((m-2)!\) cancel. Thus the simplified form is \(m\), not \(m-1\) or \(m(m-1)\).

Related tags

PermutationsCombinationsFactorialHard

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